3RV Motor Starter Protectors/Circuit Breakers up to 100 A General data Function Configuration Trip units Prevention of unintended tripping 3RV1 motor starter protectors are equipped with inverse-time delayed overload release based on the bimetal principle and with instantaneous electronic trip units (electromagnetic short- circuit releases). In order to prevent premature tripping due to the integrated phase failure sensitivity, motor starter protectors should always be connected to ensure current flows through all three main cur- rent paths. The overload releases can be adjusted in accordance with the load current.
The electronic trip units are permanently set to a value 13 times the rated current and thus enable trouble-free starting of motors. Short-circuit protection If a short-circuit occurs, the short-circuit releases of 3RV1 motor starter protectors isolate the faulty load feeder from the network and thus prevent further damage. Motor starter protectors for line-side transformer protection are set to 20 times the rated current to prevent tripping as a result of high transformer inrush current.
Motor starter protectors with a short-circuit breaking capacity of 50 kA or 100 kA are virtually short-circuit resistant at a voltage of 400 V AC, since higher short-circuit currents are not to be ex- pected in practice. The scale cover can be sealed to prevent unauthorized adjust- ments to the set current. Motor protection The trip classes of thermally delayed trip units are based on the tripping time ( t A ) at 7.2 times the set current in cold state (ex- cerpt from IEC 60947-4): CLASS 10A: 2 s t A CLASS 10: 4 s t A CLASS 20: 6 s t A CLASS 30: 9 s t A Trip classes The tripping characteristics of 3RV10/3RV11 motor starter pro- tectors are designed mainly to protect induction motors.
The motor starter protectors are therefore also referred to as motor-protective circuit breakers. The rated current I n of the motor to be protected is set on the set- ting scale. Factory setting of the short-circuit release is 13 times the rated current of the motor starter protector. This permits trouble-free starting and ensures that the motor is properly protected. The motor starter protector must trip within this time! Operating mechanisms The phase failure sensitivity of the motor starter protector en- sures that it is tripped in time in the event of a phase failure and overcurrents that occur as a result in the other phases.
S00 motor starter protectors are actuated by a rocker operating mechanism and S0, S2 and S3 motor starter protectors by a ro- tary operating mechanism. If the motor starter protector trips, the rotary operating mechanism switches to the tripped position to indicate this. Before the motor starter protector is reclosed, the rotary operating mechanism must be reset manually to the 0 po- sition. Only then can the motor starter protector be set again to the I position. Motor starter protectors with thermal overload releases are nor- mally designed in accordance with trip class 10 (CLASS 10).
Motor starter protectors of sizes S2 and S3 are also available in trip class 20 (CLASS 20) and therefore allow motors to be star- ted up under arduous conditions. Motor protection with overload relay function (automatic RESET) In the case of motor starter protectors with rotary operating me- chanisms, an electrical signal can be output by a signal switch to indicate that the motor starter protector has tripped. The 3RV11 motor starter protectors for motor protection with overload relay function are designed for the protection of induc- tion motors. All operating mechanisms can be locked in the 0 position with a padlock (shackle diameter 3.5 mm to 4.5 mm).
The motor starter protector isolating function complies with IEC 60947-2. They are equipped with the same short-circuit release and over- load release as motor starter protectors for motor protection without overload relay function. The motor starter protector always remains closed in the event of an overload. The overload release activates only two auxiliary contacts (1 NO + 1 NC). The overload trip can be signaled to a higher-level control with the help of these auxiliary contacts. Ge- nerally, it is also possible to open a downstream contactor directly. The overload signal is reset automatically. The motor starter pro- tector itself only trips if a short-circuit occurs downstream.
10 Siemens · 2009 Standard mounting for S0, S2 and S3 Structure for S0 for the setting ranges 5.5 A ... 8 A up to 20 A ... 25 A for 690 V Wiring module 1L1 3L2 5L3 1L1 3L2 5L3 Size S0: 3RV19 15-1AB Size S2: 3RV19 35-1A Size S3: 3RV19 43-3D 3RV1. .. 3RV1. .. Size S3 only: NSB0_01069b Caution: The wiring module demands 10 mm spacing 2T1 4T2 6T3 2T1 4T2 6T3 between the motor starter protectors Line side Load side Line side 1L1 3L2 5L3 1L1 3L2 5L3 3RV1. .. 3RV1. .. NSB0_01070a 2T1 4T2 6T3 2T1 4T2 6T3 Load side 1L1 3L2 5L3 3RV1. .. 2T1 4T2 6T3 1L1 3L2 5L3 3RV1. .. 2T1 4T2 6T3